diff --git a/wpa_supplicant/mbo.c b/wpa_supplicant/mbo.c
index d2f145114..43722a976 100644
--- a/wpa_supplicant/mbo.c
+++ b/wpa_supplicant/mbo.c
@@ -98,6 +98,13 @@ static void wpas_mbo_non_pref_chan_attr_body(struct wpa_supplicant *wpa_s,
 }
 
 
+static void wpas_mbo_non_pref_chan_attr_hdr(struct wpabuf *mbo, size_t size)
+{
+	wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
+	wpabuf_put_u8(mbo, size); /* Length */
+}
+
+
 static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
 					struct wpabuf *mbo, u8 start, u8 end)
 {
@@ -106,9 +113,7 @@ static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
 	if (size + 2 > wpabuf_tailroom(mbo))
 		return;
 
-	wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
-	wpabuf_put_u8(mbo, size); /* Length */
-
+	wpas_mbo_non_pref_chan_attr_hdr(mbo, size);
 	wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
 }
 
@@ -145,6 +150,8 @@ static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
 	if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num) {
 		if (subelement)
 			wpas_mbo_non_pref_chan_subelem_hdr(mbo, 4);
+		else
+			wpas_mbo_non_pref_chan_attr_hdr(mbo, 0);
 		return;
 	}
 	start_pref = &wpa_s->non_pref_chan[0];